science experiments ideas

Colour magic

Science Experiments Ideas

Cut a red cabbage leaf into small pieces and soak in a cup of boiling water. After half an hour pour
the violet coloured cabbage water into a glass. You can now use it for crazy colour magic. Place
three glasses on the table, all apparently containing pure water. In fact only the first glass contains
water, in the second is white vinegar and in the third water mixed with bicarbonate of soda. When
you pour a little cabbage water into each glass, the first liquid remains violet, the second turns red
and the third green. The violet cabbage dye has the property of turning red in acid liquids and green
in alkaline. In neutral water it does not change colour. In chemistry one can find out whether a liquid
is acid or alkaline by using similar detecting liquids indicators.